In refrigeration cycles, quality measurement of two-phase refrigerant flow is required to monitor the cycle operation. Although sectional void fraction of the two-phase flow can be detected in several ways, the quality of the two-phase flow is hardly obtained from the sectional void fraction since velocities of liquid- and gas-phase in the pipe are different from each other. In this study, a new quality measuring method was developed by installing multiple narrow tubes in a test section. By installing a gas bypass tube with the multiple narrow tubes, the quality measurement having an accuracy within 0.03 was achieved in the quality range from 0.05 to 0.8. In addition, the influence of oil contamination in the refrigerant flow on the flow pattern in the narrow tube was examined. It was found that the flow pattern in the narrow tube became bubble flow by the mixing of oil.

在制冷循环中，需要对两相制冷剂流量进行质量测量以监控循环运行。尽管可以以几种方式检测两相流的截面空隙率，但是由于管中液相和气相的速度互不相同，因此很难从截面空隙率获得两相流的质量。 。在这项研究中，通过在测试区域中安装多个细管，开发了一种新的质量测量方法。通过将气体旁通管与多个细管一起安装，可以在0.05〜0.8的质量范围内进行精度为0.03以内的质量测量。另外，研究了制冷剂流中的油污染对细管中的流型的影响。